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What do I gain with a Unity Output Power Factor (kW=kVA)?

The advantage of unity power factor is that these UPS systems are 100% compatible with today's high power factor loads. Traditionally, a UPS with a lower power factor needs to be oversized to support today's power factor corrected loads. All APC 3-phase UPS products have an output rating of kW=kVA or Unity Power Factor. Traditional double conversion units have output ratings of kW=0.8kVA.